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Car Audio Room Curve
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Old 16th August 2020, 07:04 PM   #1
bradleypnw is offline bradleypnw
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Default Car Audio Room Curve

Do you guys equalize your car audio systems to match an idealized frequency response graph?

Do you adjust it for driving speed and resulting road noise?

I saw this graph and wondered how car audio DIYers approach equalization in practical terms.
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Old 17th August 2020, 11:56 PM   #2
bjc is offline bjc  Australia
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Those are all general takes on the well known Harman curve. Unsure who had this ideal room eq setting first but jbl/harman have been in it for years.
Basically at 6-10db boost curve below 100hz and a slanting - 5db slope from 2500hz to 10k hz+.
Most of the home theatre people including myself take this approach (I used Dirac) for an in-room response.
As for the car it's up to you and go with whatever suits your listening tastes. Midbass down will drown out most road noise. Volume control for when it's louder in cabin road noise or just custom settings (A-B) for cruising and high speed...
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Old 18th August 2020, 07:44 AM   #3
Perry Babin is offline Perry Babin  United States
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As was stated above, it's down to what you like. An audiophile's system will differ greatly from someone who likes rap or techno.

What's your goal and what type of system do you need?

For the most part, equalization is to smooth the response, especially in the midrange. Heavy bass have to be built in with the appropriate equipment (power and woofers to take that power) if you want to listen at high volume.
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Old 18th August 2020, 12:56 PM   #4
Lenin89 is offline Lenin89  Bulgaria
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I will just throw in the Fletcher Munson Curve (Equal-loudness contour) to make things even more complicated
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Old 18th August 2020, 04:59 PM   #5
The Lord Flashheart is offline The Lord Flashheart  United Kingdom
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I tune car audio by ear, it’s not an environment in which to get too excited about perfect frequency response and such like given the noise and cabin limits.

A bass knob, for example, is almost mandatory given the wildly varying recording quality of music these days.
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Old 20th August 2020, 07:48 PM   #6
bradleypnw is offline bradleypnw
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Good responses here.

There's also the headphone Harman curve (attached image.) The car audio FR graph I posted above is from Floyd Toole's Sound Reproduction 3rd addition book.

When I first learned about the FR curve it was for home audio and I thought that was the target applied to all audio. Now I know there are multiple curves suited to the listening environment. And I guess we can add music style specific curves in addition to that.

But I was curious to find out if it was common practice for car audio enthusiasts to use microphones and REW sweeps to equalize FR curves toward an ideal graph the way home audio/theater enthusiasts seem to do.
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Old 20th August 2020, 08:10 PM   #7
Perry Babin is offline Perry Babin  United States
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A lot depends on what audio equipment you have. Old-school equipment will be much more limited than a system with DSP. That doesn't mean that old-school can't sound great but the choices in the equipment that you buy/use is more critical.
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Old 20th August 2020, 09:42 PM   #8
Guerilla is offline Guerilla  Denmark
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Nad casetteplayers had a CAR button for drowning noise. I dont know which frecuensies it enhanced. Otherwise one has to adjust the sound while speeding, which to me seems unsafe.

Cheers!
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Old 21st August 2020, 07:36 AM   #9
Lenin89 is offline Lenin89  Bulgaria
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Quote:
Originally Posted by bradleypnw View Post
But I was curious to find out if it was common practice for car audio enthusiasts to use microphones and REW sweeps to equalize FR curves toward an ideal graph the way home audio/theater enthusiasts seem to do.

I've done that many times, especially before EMMA or any other kind of SQ competition i'm participating or any of my "clients".
DSP is really helpful in case You know what You do. But it's really much much better to correct ACOUSTICALLY the environment instead of pumping the DSP's EQ.
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